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74HCT191N,652

P1-P3P4-P6P7-P9P10-P12P13-P14
December 1990 4
Philips Semiconductors Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
3, 2, 6, 7 Q
0
to Q
3
flip-flop outputs
4
CE count enable input (active LOW)
5
U/D up/down input
8 GND ground (0 V)
11
PL parallel load input (active LOW)
12 TC terminal count output
13
RC ripple clock output (active LOW)
14 CP clock input (LOW-to-HIGH, edge triggered)
15, 1, 10, 9 D
0
to D
3
data inputs
16 V
CC
positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.
December 1990 5
Philips Semiconductors Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
FUNCTION TABLE
TC AND RC FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
X = don’t care
↑ = LOW-to-HIGH CP transition
= one LOW level pulse
= TC goes LOW on a LOW-to-HIGH CP transition
OPERATING MODE
INPUTS OUTPUTS
PL U/D CE CP D
n
Q
n
parallel load
L
L
X
X
X
X
X
X
L
H
L
H
count up H L I ↑ X count up
count down H H I ↑ X count down
hold (do nothing) HXHXXno change
INPUTS TERMINAL COUNT STATE OUTPUTS
U/D CE CP Q
0
Q
1
Q
2
Q
3
TC RC
H
L
L
L
H
H
H
H
L
H
H
L
X
X
X
X
H
H
H
L
L
L
H
H
H
L
L
L
H
H
H
L
L
L
H
H
H
L
L
L
L
H
L
H
H
H
H
H
Fig.4 Functional diagram.
December 1990 6
Philips Semiconductors Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
Fig.5 N-stage ripple counter using ripple clock.
Fig.6 Synchronous n-stage counter using ripple carry/borrow.
Fig.7 Synchronous n-stage counter with parallel gated carry/borrow.
P1-P3P4-P6P7-P9P10-P12P13-P14

74HCT191N,652

Mfr. #:
Buy 74HCT191N,652
Manufacturer:
NXP Semiconductors
Description:
Counter ICs SYNC BIN U/D COUNTER
Lifecycle:
New from this manufacturer.
Delivery:
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